Electrolysis of Brine Flashcards
Define what Brine is
brine is a aqueous sodium chloride
Why are inert platinum electrolysis used for the electrolysis of brine
to prevent reaction with gases produced
What happens when sodium ions react with hydroxide ions?
it forms sodium hydroxide
Why is chlorine and hydrogen gases kept separate from each other?
the gases may cause an explosion due to heat or light
What happens when chlorine reacts with sodium hydroxide solution?
it’ll form to produce a mixture of sodium chloride and sodium hypochlorite.
What 2 specialised cells are needed to be used for bleach?
diaphragm cell
membrane cell
Describe the diaphragm cell
Has a diaphragm centre
made out of porous mixture of asbestos and polymers
Why is brine added on one side of the diaphragm?
So sodium hydroxide can be removed on the other side
So the brine does not flow back to the mix with chlorine produced
Describe the membrane cell and its function
Made out of a polymer that allows positive ions through
What ions can the membrane cell allow to pass through? What ions are not allowed to pass through?
Sodium ion can pass through
Chlorine ions cannot pass through
Where is sodium hydroxide formed in the compartment and why?
Formed on the right hand side so it does not mix with sodium chloride
The chlorine produced in diaphragm and membrane cells will mix with any oxygen produced at anode. What can be done for oxygen to stay as a gas?
can be purified by liquifying under pressure. This will keep the oxygen at a gas
